Switch mechanism



June 1 1926.

L. F. MEUNIER SWITCH MECHANISM Filed July 30, 1924 han@ Patented .luneli, lQZti.

NETE@ l intatta onirica.

LEON F. MEUNIER, OF CLEVELAND, OHIO, ASSIGNOR T CHICAGO PNEUMATC TOOLCOMPANY, OF NEW YORK, N. Y., A CORPORATN 0F NEW' JERSEY.

Yswirora MnoHANIsir.

Application filed July 30, 1924. Serial No. 729,050.

This invention relates to control apparatus for electrical motors andmachinery. More particularly it concerns locking mechanism controlled byone control device for temporarily rendering a second control deviceinoperative.

One object of the invention is to provide simple, positively actinglocking mechanism of the character described. is to adapt the ordinarysnap switch to control the locking mechanism. Other objects will beapparent from the detailed description which follows.

While the invention is capable of general application, the particularform thereof herein used as an illustrative example is intended for useon electric coal drills having a man switch and a reversing switch, thelocking mechanism being utilized to prevent careless and indifferentoperators from re versing the drill while it is in operation.

ln the drawings:

Figjl is a plan view partly in section on the line 1-1 of Fig. 2;

Fig. 2 is a vertical sectional view on the line 2 2 of Fig. 1 with thegreater part of the snap switch shown in elevation and the lockingmechanism in operative position;

Fig. 3 is a view similar to Fig. 2 with the entire snap switch inelevation showing the locking mechanism in normal or inoperativeposition; and

Fig. 4c is a fragmentary perspective view diagrammatic in form showingthe upper part of the snap switch and the associated elements of thelocking mechanism, the cas ing being omitted. v

The embodimentl of the invention chosen for the purpose of illustrationis contained in a casing adapted to be secured in a suitable inanner asby screw bolts a to the casing B of a coal drill, motor or otherelectrical device to be controlled. The casing, which may be in two ormore parts and may include a junction box A, in which the end of theelectric cable A2 is made fast, houses supcrposed switches, a mainswitch C of the ordinary snap type having an actuating button C and areversing switch D having a control handle d projecting beyond theeasing A and pivotcd at d therewithin for limited swinging movement.

The locking mechanism for restraining the control handle l of thereversing switch from movement when the main switch is Another object oncomprises a rod or plunger 5 mounted for reciprocatory movement inbearings (3 and 7 within the casing A, a coil spring 8 encircling rod 5and abutting against a washer 9 fixed thereto normally maintaining rod 5out of the path of movement of control han dle Z or in inoperativeposition, as shown in Fig. 3. )tod 5 is moved to operative or locl ingposition (shown in Fig. 2) when main switch C is on by a lever 1()pivoted on a pin l1 extending through guide bosses 12 within casing A.One end of lever 1() engages the upper end of rod D and the other endengages suitable actuating means on main switch C.

As previously stated, switch C is of.the ordinary snap switch typeoperated by a button c threaded on a rotatable shaft c, ,this shaft,during its rotation having two positions in which the switch is on andtwo in which it is oth a quarter turn of button c being sullicient toel'tect the change in the condition of the switch. On shaft c of thesnap switch C is disposed the apparatus for actuating lever 10 andthereby the plunger 5 to lock reversing lever CZ against movement. rlhisapparatus preferably takes the form of a plate 13 of sheet metal orother suitable material having an opening loosely receiving shaft c andhaving two pairs of spaced opposed stops l-l arranged to closely engageopposite sides of the button c when the latter is screwed down uponvplate 13 wedging the latter against the shoulder c2 on shaft c. By thisarrangement plate 13 rotates with button c and with shaft c. Plate V13may be partly cut away as indi cated at 15 to malte visible to theoperator the usual on and off indicia on the switch C. Upon plate 13 issecured by suitable mcans, such as screws 1G, a cam ring 17 carrying oneor more lateral projections 18 to engage the short arm of lever 10. Eachprojection 18 has at one end an inclined cam surface 19 on which theshort endfof the lever rides in an obvious manner. rFhis cam surfaceextends slightly above the normal height of projections 18 (Fig. 3)forming a stop shoulder 20 to prevent reverse rotation of the button c,which would unlock reverse control Z while the main switch was still oitin order to insure that the projections 18 register with the onpositions of the main switch button c', the cam ring 17 Iis adjustablerelative to plate 13 by the prollo 10. The combination with" a snapswitch having a shouldered vrotatable shaft threaded above saidshoulder, a control button .threaded on said shaft, 'an actuator plateloosely engaging said shaft and clamped a ainst. said shoulder by saidbutton, ,said p ate having lugs engaging opposite sides of said button.

11. The combination with a snap switch having a .shouldered rotatableshaft threaded above said shoulder, a; control` button threaded on saidshaft, a plate Vlooselir mounted on. said shaft'clamped between saidbutton and said shoulder, means keying said plate to said button formovement therewith, and a cam projection adjustably secured to saidplate.

12. The combination with a snap switch having a shouldered rotatableshaft threaded above said shoulder, a control button threaded on saidshaft, a` plate loosely mounted on said shaft clamped between saidbutton and said shoulder, means keyingy said plate to said button formovement therewith,

and a cam ring adjustably secured to.' said plate.

13. An actuator device for quickattachment to-a snap switch-comprising asupport plate constructed andA arranged to be clamped on the shaft ofthe switch by the control button of the latter, said plate havingprojecting lugs arranged to engage said button to insure rotation of theplate with the latter, and a cam projection adjustably secured to saidplate.

14. An actuator device for quick .attachment to a snap switch,comprising a support plate constructed and arranged to be clamped on theshaft of the switchA by the control button of the latter, saidplatehavingprojecting lugs arranged to engage said button to insurerotation of the plate with the latter, and a cam ring adjustably securedto said plate.

Signed by me at Cleveland, Ohio this th day of July 1924.

LEON MEUNIER.

